1 enum
2 {
3 	MAXQ = 256
4 };
5 
6 typedef struct Queue Queue;
7 struct Queue
8 {
9 	struct {
10 		Block *db;
11 		u32int bno;
12 	} el[MAXQ];
13 	int ri, wi, nel, closed;
14 
15 	QLock lk;
16 	Rendez r;
17 };
18 
19 Queue	*qalloc(void);
20 void	qclose(Queue*);
21 Block	*qread(Queue*, u32int*);
22 void	qwrite(Queue*, Block*, u32int);
23 void	qfree(Queue*);